chamber lamp

noun2

1. •
   An oil lamp designed for indoor use.

   • A chamber lamp burned in the fire place: by this light, as he leaned against the feet of the bed, he perceived his uncle slept. — 1828
2. •
   An indicator light associated with a chamber.

   • Position the battery toggle switch (10) figure 4-5 to BATTERY. If the fog chamber lamp illuminates, the indicator is operational. — 1984